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The Deal:AirTran has just rolled out an excellent three-day sale, offering low fares across its network of U.S. and Caribbean destinations. You’ll pay as little as $49 each way plus tax to fly to places like Boston, Atlanta, Fort Lauderdale, Aruba and Bermuda. Travel is valid through May 24.

When searching for fares, keep in mind which days of the week you’re likely to find the lowest prices. If you’re flying within the U.S., you’ll save by traveling Monday through Thursday. But if you’re headed to the Caribbean, Bermuda or Mexico, off-peak fares are available Sunday through Wednesday. The travel days with the lowest prices are noted on the AirTran site.

The Catch: Be sure to check the blackout dates — they vary by itinerary and in some cases are extensive. (Restricted dates for Florida flights, for example, include March 10 – April 4, April 21 – 25 and April 30 – May 1, 2011.)

The Competition:JetBlue is currently offering flights to a number of U.S. and Caribbean destinations, including New York, Florida, California and the Dominican Republic, starting at a comparable $52 each way.

Find these bargains and more money-saving offers in our Airfare Deals.